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J.J.Thomson's model of an atom

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It shows J.J.Thomson's contribution in the field of atoms

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J.J.Thomson's model of an atom

  1. 1. CATHODE RAY TUBE. The cathode ray tube (CRT) is a vacuum tube containing one or more electron guns (a source of electrons or electron emitter) and a fluorescent screen used to view images. It has a means to accelerate and deflect the electron beam(s) onto the screen to create the images.  The images may represent electrical waveforms (oscilloscope), pictures (television, computer monitor), radar targets or others.  CRTs have also been used as memory devices, in which case the visible light emitted from the fluorescent material (if any) is not intended to have significant meaning to a visual observer (though the visible pattern on the tube face may cryptically represent the stored data).
  2. 2. Cathode: The cathode is the negatively charged electrode. The cathode attracts cations or positive charge. The cathode is the source of electrons or an electron donor. It may accept positive charge. Anode: The anode is the positively charged electrode. The anode attracts electrons or anions. The anode may be a source of positive charge or an electron acceptor.
  3. 3. THOMSON’S EXPERIMENT WITH CATHODE RAY DISCHARGE TUBE Experiments on the magnetic deflection of cathode rays: Thomson first investigated the magnetic deflection of cathode rays. Cathode rays were produced in the side tube on the left of the apparatus and passed through the anode into the main bell-jar, where they were deflected by a magnet. Thomson detected their path by the fluorescence on a squared screen in the jar. He found that whatever the material of the anode and the gas in the jar, the deflection of the rays was the same, suggesting that the rays were of the same form whatever their origin.
  4. 4. THOMSON’S EXPERIMENT WITH CATHODE RAY DISCHARGE TUBE
  5. 5. Thomson constructed a Crookes tube with a near-perfect vacuum. At the start of the tube was the cathode from which the rays projected. The rays were sharpened to a beam by two metal slits – the first of these slits doubled as the anode, the second was connected to the earth. The beam then passed between two parallel aluminum plates, which produced an electric field between them when they were connected to a battery. The end of the tube was a large sphere where the beam would impact on the glass, created a glowing patch. Thomson pasted a scale to the surface of this sphere to measure the deflection of the beam. When the upper plate was connected to the negative pole of the battery and the lower plate to the positive pole, the glowing patch moved downwards, and when the polarity was reversed, the patch moved upwards.
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  8. 8. DONE BY: RAHUL SRIVATSAN.M.R. VISHWANATH.A. DHANRAJ.D. SANJAY.S. GANAPATHY.M. ABHINAV.R. SANTHOSH.S. VIVEK.S. VARUN PRASATH.B. AKASH.L.K.
  9. 9. THANK YOU

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